Double-acting pump



J. S, HUNTER DOUBLE ACTING PUMP Filed Sept. 24, 1928 Dec. 2, 1930.

fr? frown/5x VEN fO/e'.- kJob/2 .5- /7/6//77225 5)/ Patented Dec. 2, 1930 JOHN s. HUNTER, or ooALINemoALIFoRNrA DOUBLE-ACTIN G PUMP Applcationvled September 24, 1928. SerialNo. 307,946.

rl`his invention relates tovwell pumps, and more particularly to double acting pumps adapted for operation ina working barrel or in a pump tubing. Y

it is an object of this invention to provide a double acting pump adaptable for pumping oil from a well, although the invention may be used to pump water or any other liquid desired, and its use should not be limited thereto by the following description,

or by the accompanying claims.

It is a further object of this invention to provide. a pump which utilizes both the down stroke and the up stroke of the sucker-rods for pumping purposes, thus greatly increasing the pumping eiiiciency of the mechanism overpreviously manufactured single action pumps which utilize the movement of the sucker rods in one direction only.V

1t is a still further object of this invention to provide a double acting pump compris` ing outer and inner pump 4barrels in fixed relation, and a piston connected tothe lower end et the sucker-rods, or other pumping Y means in the well, and adapted to be reciprocated in the inner pump barrel, and valve means for controlling the flow of liquid in the pump. Other objects and advantages Vof my inventionwill be made evident hereinafter( Referring in detail to the drawings,- Fig. lillustrates a sectional longitudinal view of the upper end of my invention.

F ig. 2'illustrates a sectional longitudinal view of the lower end of myinvention.

Fig. 3 is a cross-sectional view taken on the line 3-3 of F ig. 1. K Fig. 4 is a cross-sectional view taken on the line 4-3-4 of Fig. 1.

F ig. 5 is a cross-sectional view taken on the line 5-.-5 or Fig. 1.`

Fig. 6 is a cross-sectional view taken on the line 6-6 oFig. 1.

Fig. 7 is a cross-sectional view taken on the like 77 of Fig. 2. Y

rllhis invention comprises an outer pump barrel 12 having fixed therein an inner pump barrel 13 through which a piston means 14 is adapted to be reciprocated by'means of sucker-rods 15, as'illustrated in Figs. 1 and 2.` The outerbarrel 12 has lexternal threads 16 at its upper end, said threads being adapted to be received by internal threads 17 on awell-tubing 18, thus retaining the double action pumpv construction of this invention 5e' in viXed relation to the I well-tubing.` The outer barrel 12 comprises a lower tubing member 19 having internal threads 2O at its upper end, which threadedly receive eX- ternal threads 21 of an upper tubing member22. The wall of the upper tubing member 22 is slightly thicker than the wallV of the lower tubing member 19, and a shoulder 23 isformed on the inside surface thereof.

A shortA collar 24 makes a tight sliding fit 65 around the inner pump barrel 13 and is provided-with a shoulder 25, which engages the shoulder 23. The collar 24 is provided with openings 26, as shown in Figs. 1 and 4. It is desirable, though not'necessary, that the 70 collar 24 also have a tight sliding lit with the inside of the Vouter pumpbarrel 12, so as to maintain a more rigid relationship between the inner and the outer pump barrels.v

The upper member`22, above the shoulder 23, thus `forms a continuation of the well-tubing 18 to-the lower end oli-which the pump is Vattached and defines a fluid discharge cav-V ity or passage 61 which communicates directly with the bore of thewell-tubing.

Forming a tight sliding lit with the inside Vsurface of the inner pump barrel 13 is asleeve member 27, comprising a sleeve portion 28 and a head portion 29 'formed integrally therewith. Thesleeve portion 28 is 85 provided withl openings 30, as shown in Figs. 1 and 4, and openings 31, as illustrated in F igs. 1 and 5, and is adapted to engage a shoulder 32 formedV on the inner pump barrel 13` p 90 Connecting a cavity 33.0f the inner pump barrel 13 and the. space around the outer pumpfbarrelare' ducts 34 as shown in Figs. 1 and 5, andare in alignment with the openings '31 when the sleeve member27 is in its 95 lowermost `position so that the sleeve portion 28 engagesthe shoulder. 32. In thev sleeve portion 28 is a bearing 35 through which the suclrevrro,d 15 passes, 4and which prevents whipping in the sucker-rod to a large degree when the pump is in operation, and also maintains the sucker-rod in axial alignment through the pump mechanism. rlhe construction oi' the bearing 35 is clearly illustrated in Figs. 1 and 6.

The limit or upward movement oi' the sleeve member.I Q7 is regulated by control means comprising a set screw 36 threadedly received in the outer and inner pump barrels and extending into a longitudinal slot 37 in the sleeve portion 28, said set screw 36 also preventing the rotation of the sleeve member 27. The action of this control means is most important, because if'the sleeve member 27 were all-owed to rotate, however little, such rotation would throw the openings 31 out of alignment with the ducts .34, which would be 'fatal to the successful operation of the pump, as will be readily seen from the description ot the. operation ot the pump given below.

In the head portion 29 of the sleeve member 27 is a stufling box 40 closed by a bolt 42 through which the sucker-rod 15 passes, prevent-ing oil from leaking from the well-tubing back into the pump.

The upper surface of the collar 24 contacts a compression spring 38 ot nearly the same diameter as the diameter of the collar 24, said compression spring 38 being prevented from moving upward beyond its limits of compression by a bearing 39 which it engages, said bearing 39 being adapted to be rigidly retained by the outer pump barrel and to keep the sucker-rod `15 in alignment through the pump mechanism. The bearing 89 is similar in construction to the bearing 35 in the sleeve member 27.

it the lower end of the inner pump barrel 13 is a flange 45 associated with the inner pump barrel 18 so as to engage the outer pump barrel and to hold the inner and outer pump barrels in iixed relationship. Adjacent to the flange in the inner pump barrel 13,

, are oriiices46. The piston means 14, as shown in Fig. 2, is associated with the lower end o the sucker-rod 15, and comprises a plurality oit piston cups 47, formed of leather or any other suitable material. rlhe piston cups 47 are aligned on the Vsucker-rod 15 and are spaced by washers 48. n the assembling oi' such a. piston for a double action pump, some of the piston cups are inverted and some placed upright. l have illustrated this assemblage in Fig. 2, showing the upper piston cupsl in an upright position on the sucker-rod 15, and separated from them bya spacer 49 l have shown the lower piston cups in an inverted position. The piston cups 47 are held rigidly on the sucker-rod 15 between a shoulder 5() tormed integrally on said sucker-rod which contacts the uppermost piston cup 47, and a nut 51 threadedly received on the lowermost end ot the sucker-rod which contacts the lowermost piston cup 47. The piston means 14, when assembled in the manner described, will permit a double action stroke with practically no leakage. However, any suitable piston means may be substituted for the particular means described above withont departing from the spirit of the invention.

internal threads 54 formed on the lower end oi the lower tubing member 19 of the outer pump barrel 1Q, threadedly receive a downwardly closing valve means 55, comprising a valve seat 56, a valve ball 57, and a cage 58 to contine said valve ball 57. This downwardly closing valve means is of a standard and well known construction and is commonly referred to as a standing valve in the trade. l shall hereinafter refer to said downwardly closing valve means 55 as stand ing valve 55. If the pump is to be used in :oil wells, a section of screened pipe may be y threadedly attached to the lower end of the standing valve, although l have not shown it in the drawings.

lt is necessary .tor the successful operation oi` the pump that the liquidv in the well strikes a. level on the pump higher than the ducts 34, as liquid must into the pump through these ducts as well as through the standing valve Vfhen the piston means 14 is in its downward position, weight ot the sleeve member 27 will be suiiicient to torce the sleeve member into engagement with the shoulder 32 on the inner pump barrel 1?), thus aligning the openings 31 and the ducts 34, and liquid will llow through these passage 'av into the inner pump barrel, and will ill it up behind the piston 14.

is the upstroke of the piston begins, the piston will exert considerable pressure on the liquid in the inner pump barrel 13E. Although some ot the liquid in the inner pump barrel will be iorced out of the pump through the passageways formed by the openings 31 and the duets 34, the pressure on the liquid will not be entirely relieved and said liquid `will exert a pressure on the lower surface ot the head 29 of the sleeve member 27, 'forcing the sleeve member 27 upwardly. As soon as the sleeve member Q7 begins to travel upwardly, the openings 31 will be thrown further and further out of alignment with Vthe ducts 34, until iinally the openings 31 will be completely closed by the inner pump barrel 125, and when such occurs the pressure exerted by the piston 14 on the column of liquid behind, it will be approximately equal to the pressure exerted by the liquid on the head member E29. rlfhe sleeve member 27 will continue to travel upwardly until the end oi' the slot 37 in the sleeve portion 28 engages the set screw 36, which engagement will stop the upward movement ol' the sleeve member Q7. Vvhen the sleeve member 27 attains its uppermost position, as shown by the dotted lines 60 of Fig. 1, the openings 30 will communicate with the cavity (31 in the upper portion Q2 as shown in Fig. 2, the Y of the outer pump barrel 12, and most of the liquid in the inner pump barrel 13 will be forced therethrough by the piston 14.

lVhen the piston 14 begins its upward stroke, the standing valve 55 is sucked open and liquid is sucked up into the inner pump barrel 13 by the upward motion of the piston 14 through the standing valve. Part of the liquid in the inner pump barrel 13 is forced by its own Weight through the orifices 46 into the cavity 62 formed between the inner and outer pump barrels.

As the piston 14 begins its downward stroke, the weight of the column of liquid in the outer pump barrel 12 above the head 29 forces the sleeve member 27 downwardly, as there is no upward pressure of the piston opposing it, until the sleeve portion 23 once again engages the shoulder 32 on the inner pump barrel 13, thus aligning the openings 31 and the ducts 34 and closing the openings 30 so that the liquid above the sleeve member 27 cannot flow bacl into the inner pump barrel 13. At the same time the downward pressure of the piston 14 on the column of liquid ahead of it in the inner pump barrel 13, forces the standingrvalve 55 closed, and then forces the liquid through the orifices 46 into the cavity 62.. Thus as the piston 14 moves downwardly it forces the liquid ahead of it through the orifices 46 and sucks liquid behind it through the passageways formed by the openings3l and the ducts 34. The portion of the inner pump barrel 13 behind the piston 14 is then filling with liquid while the liquid ahead of the piston is being forced into the cavity 62.

The piston 14 exerts considerable pressure on the column of liquid in the cavity 62, which in turn exerts a pressure on the collar 24. When the upward force exerted by the column of liquid in the cavity 62 exceeds the combined downward forces of the compression spring 38 bearing against the collar 24,

; and the collar 24, the collar will move upwardly against the action of the compression When the piston 14 comes to the end of its i downward stroke and ronce more starts upwardly, the pressure of the compression spring 38 on the collar 24 will. no longer be opposed by an upward pressure in the cavity 62, and the collar 24 will be forced downwardly until the shoulder 25 thereon engages the shoulder 23 formed on the upper portion 22 of the outer pump barrel 12, thus preventing the liquid in the cavity G1 from iiowing back into the cavity '62.

From the foregoing description it is apparent that I have provided a double action ly closing valveV means comprising a collar slidably fitting on said inner barrel and adapted to control communication between a space formed by said inner and outer barrels and said fluid delivery passage; downwardly closing valve means comprising a sleeve member slidably fitting in said inner barrel and-adapted to control communication between the interiorofl said inner. barrel and said fluid delivery passage and also to control communication between the interior of said inner barrel and the space outside the outer barrel by means ofa duct; and piston means adapted to be reciprocated within said inner barrel. y'

2. In a double acting pump, the coinbination of: an outer barrel adapted for attachment to awell-tubing vand provided at its lower end with downwardly 'closing valve means; an inner barrel fiXedwithin saidouter i barrel, and communicating with said outer barrel by'orifices at its lower end, said outer barrel being' extended above said inner barrel to forma fluid delivery passage for delivering pumped fluid to said well-tubing; crownwardly closing valve4 means comprising a collar slidably fitting on said inner barrel and adapted to control communication between a space formed by said inner and outer barrels 'and said 'fluid delivery passage; downwardly closing valve means comprising a sleeve member slidably fitting in said inner barrel and adapted toV control communication between the interior of said inner barrel and said fluid delivery passage, and also adapted to control communication between the interior of said inner barrel andthe space outside the outer barrel vby means of a duct; spring means rigidly associated with said outer barrel and adapted to engage saidslidably fitting collar;

and piston means adapted'to be ieciprocated within said inner barrel. j

3,- In a double acting pump, the combination of an outer barrel adapted for attach"- inent to awell tubing and provided at its lower end with a downwardly closing valve means; an inner barrel fixed within said outer barrel and communicating with said outer barrel at its lower end, said outer barrel being extended above said innerV barrel to forni a fluid delivery passage for delivering pumped fluidto said well-tubing downwardly closing valve means adapted to control communication between a space formed by said inner and outer barrels and said luid delivery passage; downwardly closing valve means comprising` a sleeve member slidably iitting in said inner barrel and adapted to control communication between the interior of said inner barrel and said fluid delivery passage, and also adapted to control communication between the interior of said inner barrel and the space outside the outer barrel by means of a duct; means for controlling the movement of said sleeve member; and piston means adapted to be reciprocated within said inner barrel.

4c. In a double acting pump; the combination of: an outer barrel adapted 'or attachment to a well tubing and provided at its lower end with downwardly closing valve means; an inner barrel fixed within said outer barrel, and communicating with said outer barrel by orifices at its lower end, said outer barrel being extended above said inner barrel to form a fluid delivery passage for delivering pumped Huid to said well-tubing; dowm Yardly closing valve means adapted to control communication between a space formed by said inner and outer barrels and said fluid delivery passage; downwardly closing valve means comprising a sleeve member slidably litting in said inner barrel and adapted to control communication between the interior of said inner barrel and said fluid delivery passage, said sleeve member cooperating with a duct adapted to communicate between the interior of said inner barrel and the space outside said outer barrel; means for controlling the movement of said sleeve member; piston means adapted to be reciprocated wit-hin said inner barrel; and bearing means carried by said sleeve member adapted to guide a means for reciprocating said piston means.

5. A combination as claimed in claim 2 in which means is provided for centralizing the piston reciprocating means.

6. A combination as claimed in claim 2 in which means is provided for controlling the movement of said sleeve member.

7. A combination as claimed in claim 2 in which means is provided for controlling the movement of said sleeve member and wherein the piston reciprocating` means is centralized.

8. A combination as described in claim 4 in which means is provided for centralizing the piston reciprocating means. Y

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 11th day of September, 1928.

JOHN S. HUNTER. 

